Zip lock closure

ABSTRACT

A one-way, zip-locking closure for bag-type containers that include slider zipper arrangements. The locking mechanism includes a series of registration structures that is provided along one side of the mouth of the containers and a catch mechanism that is provided within the slider. The catch mechanism engages the series of registration structures as the slider is moved to close the mouth of the container, and thereby prevents movement of the slider in the opposite direction.

TECHNICAL FIELD

The present invention relates to closure arrangements for flexiblebag-type containers. More particularly, the present invention relates toone-way zip-locking closures for bag-type containers.

BACKGROUND ART

There are numerous closures for bag-type containers such as polymericbags that are used for storing non-food items, food products, medicalsupplies, waste materials, and many other items.

Bag-type containers having closure structures are well known. Typicallybag-type containers are provided with mouths or openings along a topside thereof. The mouths or openings are defined by opposed side edgesof the containers that can be coupled together along the top side (theclosed position) or uncoupled so as to define the mouth or opening (theopen position). To provide such a closable function, the opposite sideedges of the containers are provided with cooperating structuralfeatures that can be coupled together or interlocked.

There are different types of closure structures for bag-type containers,including those that include slider devices that couple and uncouple theclosure structures, those that are do not include slider devices thatcouple and uncouple the closure structures, and those that areresealable and those that are not resealable.

U.S. Pat. No. 5,138,750 to Gundlach et al. exemplifies a bag-typeclosure that includes a closure structure that is operated by pressingthe opposite sides of the mouth of the bag together. Using this type ofbag-type closure, the user typically squeezes the opposite sides of themouth together between his or her thumb and index finger and slides hisor her finger and thumb along the mouth of the bag so that thecooperating interlocking or coupling structures are engaged together. Analternative approach that some people take is to squeeze incrementalportions of the opposite sides of the mouth of the bag together alongthe length there. Once closed, the mouth of the bag can be opened bygripping and pulling the opposite sides of the mouth of the bag apart.Such a bag is resealable.

U.S. Pat. No. 2,810,944 to Sander exemplifies a bag-type closure thatincludes a closure mechanism having a slider. The slider can be thoughtof as providing a function similar the user's thumb and index finger asdiscussed above in U.S. Pat. No. 5,138,750. That is, the slider, whichis slidably coupled to each of the opposite sides of the mouth of thebag, is configured so that as it is slid in one direction, it couplesthe cooperating interlocking or coupling structures of the mouth of thebag together. In contrast, as the slider is slid in the oppositedirection, it uncouples the cooperating interlocking or couplingstructures of the mouth of the bag.

U.S. Pat. No. 5,372,428 to Bruno et al. and U.S. Pat. No. 6,004,032 toKapperman et al. exemplify non-resealable bag-type closures which areconfigured to be permanently sealed after various items and substancesare placed therein. The mouths of non-resealable bag-type closuresinclude cooperating interlocking or coupling structures, which whenengaged together, resist being opened. In some cases, it is known toprovide bags having non-resealable bag-type closures with secondarymeans for gaining access to the contents thereof. For example such bagscan include tearable, e.g. perforated, frangible, etc. portions that canbe torn apart to gain access to the contents of the bags.

The present invention provides one-way zip-locking closures for bag-typecontainers.

DISCLOSURE OF THE INVENTION

According to various features, characteristics and embodiments of thepresent invention which will become apparent as the description thereofproceeds, the present invention provides a one-way, zip-locking closurefor a bag-type container having a mouth defined by opposed side panels,the one-way, zip-locking closure including:

cooperating coupling structures on inner surfaces of the opposed sidepanels adjacent the mouth;

a slider coupled to the cooperating coupling structures for closing themouth of the bag-type container when slid in a first direction between afirst position to a second position;

a series of registration structures provided along at least one side ofthe mouth;

a catch mechanism provided within the slider for engaging the series ofregistration structures and thereby preventing the slider from slidingin a second direction opposite the first direction.

The present invention further provides an improvement in bag-typecontainers that include zip-lock mechanisms, including sliders, theimprovement including:

a series of registration structures provided along at least a portion ofa width of the container; and

a catch mechanism within the slider which engages the series ofregistrations and thereby restricts movement of the slider in only onedirection.

The present invention further provides a method of locking a mouth of abag-type container in a closed position which comprises:

providing a bag-type container having a mouth defined by opposed sidepanels;

providing cooperating coupling structures on inner surfaces of theopposed side panels adjacent the mouth;

coupling a slider to the cooperating coupling structures for closing themouth of the bag-type container when slid in a first direction between afirst position to a second position;

providing a series of registration structures along at least one side ofthe mouth;

providing a catch mechanism within the slider for engaging the series ofregistration structures and thereby preventing the slider from slidingin a second direction opposite the first direction and

sliding the slider along the first direction from an open position to aclosed position so that the catch mechanism engages the series ofregistration structures and prevents movement of the slider in thesecond direction.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will be described with reference to the attacheddrawings which are given as non-limiting examples only, in which:

FIG. 1 is a perspective view of a conventional wire harness.

FIG. 2 is a perspective view that exemplifies a conventional a bag-typecontainer, provided with a closure mechanism having a slider.

FIG. 3 is a perspective view of a bag-type container according to oneembodiment of the present invention that is provided with a one-wayzipper-locking closure.

FIG. 4 is a cross sectional view of a locking slider according to oneembodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is directed to one-way zip-locking closures forbag-type containers. The one-way zip-locking closures of the presentinvention can be used in conjunction with a variety of containers thatinclude mouths defined by opposed panel members. The one-way zip-lockingclosures of the present invention include a series of registrationstructures and a catch mechanism that is configured to engage theregistration structures. The catch mechanism is provided on a sliderstructure and can comprise a biased structure that deflects against theregistration structures in one direction and engages the registrationstructures in an opposite direction. The slider structure is configuredto slide along the mouths of the containers. Opposite sides of themouths of the containers are provided with cooperating interlocking orcoupling structures which become engaged together as the slider is movedin one direction along the mouths. As the catch mechanism of the sliderengages the registration structures, the slider is prevented from beingslide in an opposite direction. Thus, in effect, a container providedwith the one-way zip-locking mechanism of the present invention can beclosed, but not opened once closed.

The one-way zip-lock mechanism of the present invention can be readilyincorporated into the structure of conventional zip-lock plastic bagsthat include cooperating interlocking or coupling structures on oppositeinner sides of the mouths thereof. For such incorporation, one or bothof the outer sides of the mouth of the bags can be provided with theseries of registration structures and an inner portion(s) of the slidercan be provided with the catch mechanism(s).

According to one embodiment of the present invention, one or both of theouter surfaces of a zip-lock bag is/are provided with a series of teethand the slider is provided with one or more tangs that is/are biased toengage the series of teeth in one direction. In alternative embodiments,the series of registration structures can be projections and/ordepressions with any convenient shape, including rectangular, circular,etc., and the catch mechanism can be complementarily configured toengage the registration structures in one direction. It is also possibleto provide the series of registration structures on less the entirewidth of the containers. For example, a discrete series of registrationstructures could be provided near the side of the container whereat theslider would be position when the mouth of the container is completelyclosed.

Since the one-way zipper-lock closures of the present invention aredesigned and configured to lock in the closed position, bag-typecontainers provided with the one-way zipper-lock closures can be cutopen to gain access to the contents thereof. Otherwise, the bag-typecontainers of the present invention can be provided with rupturable,frangible, tearable, breachable, or similar structures or portions bywhich access to the contents thereof can be gained without the need ofscissors, knifes, or other auxiliary tools. For example, a portion orarea of the bag-type containers can be perforated or otherwise weakenedor provided with non-resealable structures to gain access to thecontents therein if desired.

FIG. 1 is a perspective view of a conventional wire harness. The wireharness 1 includes a strap 2 having a serrated portion 3 along one sidethereof, a head 4 at one end of the strap 2 and a free end 5 oppositethe head 4. The head 4 includes an aperture 6 that is configured toreceive the strap 2 therein. The head 4 also includes an internal tang 7which is configured to engage the strap 2 along the serrated portion 3in a known manner. The wire harness 1 is used by inserting the free end5 into the aperture 6 of the head 4 and pulling (or pushing) the strap 2into and through the aperture 6 until the internal tang 7 engages theserrated portion 3 of the strap 2. The wire harness 1 is tightened aboutan article or articles by pulling the strap 2 tightly through theaperture 6. The tang 7 engages the serrated portion 3 of the strap 2 sothat while the strap 2 can be pulled through the aperture 6 in the head4 in one direction (the tightening direction), the strap 2 resistsmovement through the aperture 6 in an opposite direction. Wire harnessesare typically used to bundle wire together and therefore sometimesreferred to as wire ties or wire straps. Once tightened, wire harnessescan only be opened by cutting the exposed strap portion or otherwisebreaking the head or tang of thereof. The tangs of wire harnesses aretypically biased to engage the serrated portions and deflect, when thestrap is slid through the aperture in the head in the tightening orlocking direction. When an attempt is made to slide the strap in theopposite direction, the biased tang engages the serrated portion andlocks the strap from movement.

FIG. 2 is a perspective view that exemplifies a conventional a bag-typecontainer, provided with a closure mechanism having a slider. Thebag-type container 10 in FIG. 2 is formed from side panel members 11, 12that are sealed together or integral along the bottom 13 and sides 14. Amouth or opening 15 provided along a top side of the bag-type container10 is defined by opposed top side edges of the side panel members 11,12. The opposite top side edges of the bag-type container 10 areprovided with cooperating coupling structures 16, 17 that can be coupledtogether or interlocked. Such cooperating coupling structures 16, 17 areexemplified by elongate beading elements that have cross sectionalprofiles or shapes that allow the opposed beading elements on oppositesides of the mouth or opening 15 to engage and be coupled together orinterlock. In the case of bag-type containers that are provided with aslider 18 as in the case of FIG. 2, the cooperating coupling structures16, 17 (opposed beading elements) are configured so that when the slider18 is slid in one direction, the slider 18 couples the cooperatingcoupling structures 16, 17 of the mouth or opening 15 of the bag-typecontainer 10 together. In contrast, as the slider 18 is slid in theopposite direction, the slider 18 uncouples the cooperating couplingstructures 16, 17 of the mouth or opening 15 of the bag-type container10.

The slider 18 includes a body section 19 and a pair of side legs 20, 21that are configured to extend downward over the outer top edges of themouth or opening 15 of the bag-type container 10 and engage the outer orside portions of the cooperating coupling structures 16, 17 so that theslider 18 slides along the top of the bag-type container 10 while innersurfaces of the legs 20, 21 engage the cooperating coupling structures16, 17 and prevent the slider 18 from being pull off the top of thebag-type container 10.

FIG. 3 is a perspective view of a bag-type container according to oneembodiment of the present invention that is provided with a one-wayzipper-locking closure. In their simplest forms, the one-wayzipper-locking closures of the present invention can be thought of asincorporating the features of a wire harness into a bag-type containerthat is provided with a closure mechanism having a slider. Specifically,the serrated element of a wire harness is provided along one or bothopposite outer side edges of the mouth or opening of a bag-type closure,and the tang element (or two or more tang elements) of a wire harnessare provided in the slider. With this combination, as the slider isslide across the mouth or opening of the bag-type container, the tang(s)within the slider engages the serrated portion(s) on the outer sideedge(s) of the mouth or opening of a bag-type closure so that, as theslider is slide along the direction that causes the bag-type containerto become closed, the slider cannot be moved in the opposite direction.Accordingly, once the bag-type container if closed, it cannot be openedby manipulating the slider.

The bag-type container 30 in FIG. 3 is formed from side panel members31, 32 that are sealed together or integral along the bottom 33 andsides 34. A mouth or opening 35 provided along a top side of thebag-type container 30 is defined by opposed top side edges of the sidepanel members 31, 32. The opposite top side edges of the bag-typecontainer 30 are provided with cooperating coupling structures 36, 37that can couple together or interlocked in a known manner. Suchcooperating coupling structures 36, 37 are exemplified by elongatebeading elements that have cross sectional profiles or shapes that allowthe opposed beading elements on opposite sides of the mouth or opening35 to engage and couple together or interlock. According to the presentinvention, the cooperating coupling structures 36, 37 are preferablyconfigured so that once coupled together, they cannot be easily pulledapart or uncoupled. In the bag-type container 30 of FIG. 3, thecooperating coupling structures 36, 37 (opposed beading elements) areconfigured so that when the slider 38 is slid in the direction indicatedby arrow “A,” the slider 38 couples the cooperating coupling structures36, 37 of the mouth or opening 35 of the bag-type container 30 together.The slider 38 could be configured so that if it were possible to slidethe slider 38 in the opposite direction indicated by arrow “B,” theslider 38 would uncouple the cooperating coupling structures 36, 37 ofthe mouth or opening 35 of the bag-type container 30. That is, althoughprovisions do not have to be made for the slider 38 to uncouple thecooperating coupling structures 36, 37, the present invention could berealized by including the series of registration structures and catchmechanism(s) in a conventional bag-type container provided with a sliderthat allow the mouth or opening of the container to be opened or closedby operation of the slider.

The slider 38 includes a body section 39 and a pair of side legs 40, 41that are configured to extend downward over the outer top edges of themouth or opening 35 of the bag-type container 30 and engage the outer orside portions of the cooperating coupling structures 36, 37 so that theslider 38 slides along the top of the bag-type container 30 while innersurfaces of the legs 40, 41 engage the cooperating coupling structures36, 37 and prevent the slider 38 from being pull off the top of thebag-type container 30.

A series of registration structures 42 are shown as being provided on anouter side of the mouth or opening 35 of the bag-type container 30. Thisseries of registration structures 42 can comprise teeth-shapedstructures similar to the serrated portion 3 of the wire harness 1depicted in FIG. 1. Alternatively, the series of registration structures42 can comprise projections and/or depressions with any convenientshape, including for example, rectangular, circular, etc. In addition,the series of registration structures 42 can be provided on one or bothof the outer sides of the mouth or opening 35 of the bag-type container30. Alternatively, or in addition, the series of registration structures42 can be provided along the top edges(s) of the mouth or opening 35 ofthe bag-type container 30.

In order to perform the one-way zip-locking function, the slider 38 inFIG. 3 is provided with a catch mechanism 50 (see FIG. 4) that isconfigured to engage the registration structures 42. The catch mechanism50 can comprise an internal tang similar to that used in the wireharness 1 of FIG. 1.

FIG. 4 is a cross sectional view of a locking slider according to oneembodiment of the present invention. The slider 38 in FIG. 4 is depictedas having engaged cooperating coupling structures 36, 37 together in aknown manner. In FIG. 4 the outer side of one of the cooperatingcoupling structure 37 is depicted as including a series of registrationstructures 42 thereon. The series of registration structures 42 and beaffixed to or integral with the cooperating coupling structure 37. Acatch mechanism 50 in the form or a biased tang is provided on an innersurface of the slider 38 adjacent the outer side of the cooperatingcoupling structure 37 having the series of registration structures 42.The catch mechanism 50 engages the registration structures 42 in amanner similar to the functioning of the wire harness 1 discussed above,to allow the slider 38 to be slide only in the direction that causes thebag-type container 30 to be closed. Therefore, the one-way zip-lockingclosure mechanism of the present invention allows a bag-type containerto be closed and, once closed, prevents the bag-type container frombeing opened.

The catch mechanism 50 can comprise a biased structure, e.g. metal tangthat deflects against the registration structures 42 in one directionand engages the registration structures 42 in an opposite direction.Such structures are found in wire harnesses. The catch mechanism 50 canbe angled with respect to the registration structures 42 so as to bedeflected thereby in one direction and become engaged in an oppositedirection. Otherwise, the shape of the registration structures 42 can beconfigured to slide over and deflect the catch mechanism 50 in onedirection and engage the catch mechanism in an opposite direction. Forexample, the registration structures can have tapered, sloped or othercam shapes that are configured to slide over and deflect the catchmechanism 50 in one direction and engage the catch mechanism in anopposite direction. The catch mechanism can therefore be biased with orwithout the use of a supplemental means such as a separate springelement.

In order to simplify the description, FIG. 4 depicts an embodiment ofthe invention in which the series of registration structures 42 areprovided on one of the outer sides of the mouth or opening 35 of thebag-type container 30 (actually on the outer side of the cooperatingcoupling structure 37). As discussed above, the series of registrationstructures 42 can be provided on one or both of the outer sides of themouth or opening 35 of the bag-type container 30 or, alternatively or inaddition, along the top edges(s) of the mouth or opening 35 of thebag-type container 30. In such alternative embodiments, appropriatedcatch mechanisms 50 can be provided in inner surfaces of the slider 50adjacent the registration structures for purposes of engaging theregistration structures 42. It is also to be understood that the catchmechanisms 50 can be complementarily configured to engage theregistration structures 42.

Once the bag-type containers of the present invention are closed, theycan be cut open to gain access to the contents thereof. Otherwise, thebag-type containers of the present invention can be provided withrupturable, frangible, tearable, breachable, or similar structures orportions by which access to the contents thereof can be gained withoutthe need of scissors, knifes, or other auxiliary tools. For example, aportion or area of the bag-type containers can be perforated orotherwise weakened or provided with non-resealable structures to gainaccess to the contents therein if desired.

Bag-type containers having the one-way zip-locking closures of thepresent invention can provide solutions to a number of problems. Forexample, bag-type containers of the present invention can be used tocollect evidence at crime scenes and thereby limit the possibility thatsuch collected evidence can be tampered with after the one-wayzip-locking closures are closed. In hospitals and medical clinics, bodyfluid samples are often enclosed in small resealable plastic bags whenthey are transported. Providing such small resealable plastic bags withthe one-way zip-locking closures of the present invention will increasethe safety of handling and transporting such samples. Bag-typecontainers having the one-way zip-locking closures of the presentinvention can be used to pack school lunches and thereby ensure thatsuch lunches will not be tampered with. Bag-type containers providedwith the one-way zip-locking closures of the present invention can beused to courier documents while providing a means of determining if thedocuments have been accessed by unauthorized persons. These are only avery limited list of uses of the one-way zip-closing closures of thepresent invention. The bag-type containers could be made from plasticmaterials, foils, woven materials, laminates, and other flexiblematerials.

Although the present invention has been described with reference toparticular means, materials and embodiments, from the foregoingdescription, one skilled in the art can easily ascertain the essentialcharacteristics of the present invention and various changes andmodifications can be made to adapt the various uses and characteristicswithout departing from the spirit and scope of claims which are attachedbelow.

1-15. (canceled)
 16. A bag-type container having a mouth defined byopposed side panels, said bag-type container comprising: cooperatingcoupling structures on inner surfaces of the opposed side panelsadjacent the mouth; a slider coupled to the cooperating couplingstructures for closing the mouth of the bag-type containing when slid ina first direction between a first position to a second position; and aseries of projecting structures provided along at least one side of thebag-type container near the mouth and spaced away from an upper top edgeof the bag-type container.
 17. A bag-type container according to claim16, wherein a series of projecting structures is spaced away from a topedge of the cooperating coupling structures.
 18. A bag-type containeraccording to claim 16, wherein a series of projecting structures isprovided along both sides of the bag-type container near the mouth. 19.A bag-type container according to claim 16, wherein the projectingstructures are substantially parallel to one another and to side edgesof the bag-type container.
 20. A bag-type container according to claim17, wherein the projecting structures are substantially parallel to oneanother and to side edges of the bag-type container.
 21. A bag-typecontainer according to claim 16, wherein the series of projectingstructures extend across the entire width of the bag-type container. 22.A bag-type container according to claim 1 16, wherein the slider extendsover the series of projecting structures.
 23. A bag-type containeraccording to claim 16, wherein the slider is provided with a structurethat abuts the series of projecting structures.